Any 'empty' container is really full of air, so you don't have to do anything. Pick up a test tube. It's full of air.
a barometer
yes they collect poisonous particles and liquids from the air
Hydrogen is highly soluble in air. You won't be able to collect it it over air. Hence other methods are preferred
Water caper and jet streams
water vapor
oxygen
On the outdoor coil
By fractional distillation of liquefied air.
Scientists collect and test air sample because they want to see how clean/polluted it is. Then they can raise awareness to people if needed.
a barometer
use your brain
No one knows
Yes it is possible. Think about it, cold air is more dense than hot air. If we can create solar panels to collect energy, we Can create panels to collect cold and convert it to energy
At the top section of the condenser.
yes they collect poisonous particles and liquids from the air
Develops and conducts occupational surveys.
mage caption The Namib Desert beetle harvests moisture from the air to survive . A US start-up has turned to nature to help bring water to arid areas by drawing moisture from the air